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10_Wiki/Dev/Topic_Python/Python_Inner_Classes.md

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+---
+id: python-inner-classes
+title: "Python Inner Classes"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["nested class", "파이썬 내부 클래스"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["python", "programming", "w3schools", "inner-class", "nested-class"]
+raw_sources: ["https://www.w3schools.com/python/python_class_inner.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python Inner Classes]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+An inner class defined inside another does NOT automatically get access to the outer instance — the outer object must explicitly pass itself as an argument to the inner class for the inner class to reach the outer's data. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Inner class** — a class defined inside another class. [S1]
+- **Purpose** — grouping helper classes that are only used within the outer class's context, improving organization. [S1]
+- **Accessing from outside** — `outer = Outer(); inner = outer.Inner(); inner.display()`. [S1]
+- **No automatic outer access** — inner classes do NOT automatically see the outer instance; the outer instance must be passed explicitly as a parameter. [S1]
+- **Multiple inner classes** — a class can contain several inner classes (e.g. `Computer` containing `CPU` and `RAM`). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Self-referential composition** — `self.engine = self.Engine()` inside `Car.__init__` is the idiomatic way to instantiate an inner class as a property of the outer instance, giving each `Car` object its own `Engine` sub-object. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic inner class access: `outer = Outer(); inner = outer.Inner(); inner.display()`. [S1]
+- Passing outer instance for access: `class Inner: def __init__(self, outer): self.outer = outer; def display(self): print(f"Outer class name: {self.outer.name}")`; created via `inner = outer.Inner(outer)`. [S1]
+- Practical composition example: `Car` class instantiates its own `Engine` inner class as `self.engine = self.Engine()`, then `car.engine.start()` controls the sub-object. [S1]
+- Multiple inner classes: `Computer` class with `self.cpu = self.CPU()` and `self.ram = self.RAM()`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — Car의 Engine, Computer의 CPU/RAM처럼 "부품" 관계를 표현하는 컴포지션 패턴에 표준적으로 쓰인다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Self-referential inner class composition (Python):
+```python
+class Car:
+    def __init__(self, brand, model):
+        self.brand = brand
+        self.model = model
+        self.engine = self.Engine()
+    class Engine:
+        def __init__(self):
+            self.status = "Off"
+        def start(self):
+            self.status = "Running"
+
+car = Car("Toyota", "Corolla")
+car.engine.start()
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Python Tutorial]]
+- **관련 개념:** [[Python Classes]], [[Python Class Init Method]]
+- **참조 맥락:** 부품(has-a) 관계를 표현하는 클래스 구성 패턴 — OOP 챕터의 마지막 개념.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python Inner Classes — https://www.w3schools.com/python/python_class_inner.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python Inner Classes" page (Astra wiki-curation, P-Reinforce v3.1 format).